How does the LSQ evaluation work for plane?

[[Ra...]]

Hi everyone,

I inspect injection molded parts on a daily basis and for new parts also, in order for mold correction I need to give coordinates according to the dimension.

My problem is that in some places , we make points on a flat surface in order to know warpage and then recall them to a plane.But I'm still unclear about how these points are converted in to a plane, i know it uses LSQ evaluation but what calculation goes behind this?
And is there any way that we can simulate or predict the plane generated from any set of points?

[[Cl...]]

Ramesh, LSQ evaluation is for all intents and purposes the average. Outer Tangential & Inner Tangential evaluations are the highest and lowest points respectively. Scan points at high density and use the CAD evaluation to see the plus/minus material condition.

[[Ma...]]

LSQ is method of least squares. The 2 angles of the plane are allowed to rotate and ordinate value is allowed to translate until the least sum of the errors squared is achieved.